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In debugging and testing process of the intelligent substation process level intelligence unit ,it need to build multiple sets of test environments, with the wiring complexity and low efficiency. For this case, we design of a portable intelligent substation testing device based on PXI bus, describe the system architecture and software system implementations, focusing on the hardware configuration and the main board of the device works, describe the configuration type test software implementation and testing process, introduces the test purpose and implementation of each test item. The device implements the automatic testing of the intelligent unit, reducing the number of supporting test equipment. Practical application shows that the test device based on intelligent unit operation PXI bus is good, it meets the design requirements and the testing needs of the scene. Introduction Currently the field testing device has capacity to test secondary equipments in intelligent substation, such as merge units, intelligent terminal or spacer monomers. Aiming at different item in test process, it needs the cooperation of multiple sets of testing device. At the same time, there are still some problems existing in debugging process, for example complex device wiring, low efficiency, long time for devices debugging, and overall effectiveness and accuracy of that intelligent substation is still unknown[1-5]. PXI bus technology has been the mainstream design scheme in automatic testing system which widely used in recent years. Compared with traditional automatic testing systems, PXI technology combines PC technology, instrument technology and abides Oka mechanical specifications. Moreover it provides high-performance I/O slot with high-speed data transmission and dedicated 10MHz oscillator clock. Consequently it has following advantages: the reliability, modularization, structural normalization that makes it easier to upgrade and maintain. In addition, testing system based on PXI bus technology also has other advantages such as low cost, low technology risk, shorter development cycle. Overall, it is ideal for development of testing instrument use in intelligent substation [6-7]. The control technology of configuration software has characters of opening, easy using and generality which via hardware configuration, data configuration, screen configuration to complete development work of testing software. It effectively improve the testing work efficiency and reduce the workload of testers and suitable to function integration of multiple sets of independent software. Therefore, a new design of portable testing device used in intelligent substation based on PXI bus is presented in paper, and testing items and methods can be performed by the device are also presented at the same time. The device combines the PXI bus technology and configuration software technology, it meets the testing demand of secondary equipment in intelligent substation, the configuration method is easy and suitable to on-site test application and accords with the development trend of intelligent testing device in intelligent substation. System Architecture With the application and promotion of intelligent substation, merge unit, intelligent terminal as bridge between transformers, switch and spacer layer devices have become important devices for 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 2015) © 2015. The authors Published by Atlantis Press 1913 information sampling and command execution. Therefore the accuracy and reliable of merge unit and intelligent terminal must to be validated by test[1]. The test item of intelligent terminal include: test of merging unit and intelligent terminal. The test item of merge unit include: analog precision test, error and alarm functional test; test item of intelligent terminal include: input and output test. Miniaturized and portable PXI chassis is selected which make testing device easier to carry, and it is reinforced with strong resistance to shock and impact and good thermal performance [1-4]. The overall architecture of portable testing device is shown in Figure 1. Hardware system provides various functions such as analog signal sampling, input and output, GPS signal and alarm signal transmission, reception and control though PXI module. Software system is designed based on Labview virtual instrument platform, various testing functions can be configured flexible which meets the debugging demands of intelligent substation. All functional tests can be performed automatically as preset script, test result can be displayed on screen. Test interface can be connected though PC display or LCD screen that device carrying. Test results can be output through the printer when test is completed. Fig 1. portable device debugging overall chart Hardware Design According to the field demands of the secondary equipment in intelligent substation, portable testing device consist of following modules: PXI platform, system controller, network interface board based on FPGA, timing unit board, digital I/O board, etc. All boards are designed based on modular principle and can be combined to build different testing system according to on-site application [9-10]. The 8 slot 3U size PXI chassis provided by United States NI company is chosen for PXI case, which complies with the PXI and Compact PCI standard specification. The chassis contains the system controller and power plug, is the main control part of the whole device.

A Portable Test Device for Smart Substation Based on PXI Bus